Well #1,2 hens, no question. The others have me stumped. They look more like rooster heads-esp looks like hackle feathers coming in on most of them-more pictures I guess would help. The buffs, not sure. Side shots would help.
I had
1 and 2 pegged as pullets
2, 3,7, 8 as roos
but 4 and 5 are more like my adult hens now .... so they have me confused. they seem to be getting more fluffy rear ends too !